British Transport Police officers check that passengers are wearing face coverings on a Picadilly Line tube train at Hammersmith underground station in west London on November 30, 2021. Britain will require all arriving passengers to isolate until they can show a negative PCR test against Covid-19 and is restoring a mandate to wear face masks in shops and public transport as part of its response to the new Omicron strain of Covid-19. (Photo by Adrian Dennis/AFP Photo)
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